ChemistryThe cell Pt|H2(1 bar)|HCl(m)|AgCl(s)|Ag has an Stadard elctrode potential value of 0.2224V at 298K Using the Nernst equation, calculate a value for the EMF when the HCl concentration is 0.20M. I know what the Nernst equation is but I am unsure how to use it when I only have ...
January 14, 2009

englishSay one of the funniest moments you had in school and tell them why that was so memorable and funny
January 13, 2009

AP World HistoryWell we are doing a project on empire building and we had to answer a couple of questions. I looked all over the internet and I can't find answers to these four questions. this is due tomorrow so I'm really desperate. Can someone help me out? My empire is the Spanish ...
January 11, 2009

ChemistryOne mole of nirtogen at 273K occupying 10 litres (state 1) is to be expanded to a volume of 20 litres at 373K (state 2). An infinite number of paths from state 1 to state 2 are possible. Consider the following important paths: (a) The gas is expanded isothermally and ...
January 8, 2009

6th gradeI'm supposed to write a paper on the "real" reason behind not running in the house. It's just why you think you shouldn't run in the house, just something funny nothing real. What should I say is the reason, that will make my class laugh?
January 7, 2009

ChemistryA conductivity cell was calibrated using KCl solution (0.01 mol dm^-3) with a conductivity of 0.141 S m^-1 and the resistance was found to be 520 Ohms. The resistance of a saturated solution of silver chloride was found to be 3.8 x 10^5 Ohms. Calculate the solubility product ...
January 4, 2009

ChemistryWhich phosphates are found in human urine? I am writing about the discovery of phosphorus. I know that after urine was left to stand for several days and boiled to a paste it contained ammonium sodium hydrogen phosphate. Is this a constituent of fresh urine or did a reaction ...
January 4, 2009

Chemistry/MathWrite a differential equation describing a second order reaction  a reaction in which the rate of depletion of the concentration of the reactants depends on the square of reactants concentration. Solve this differential equation and hence find an expression for the...
November 10, 2008

MathsP=(2J+1)exp(-(BJ(J+1))/kT) where B, k and T are constants a. Show that dP/dJ=(2-(B(2J+1)^2)/kT)exp(-BJ(J+1)/kT) b. Show that P exhibits a maximum and determine the expression for Jmax c. Find the value of P when J=0 and the limiting value of P when J becomes large(infinity).
October 28, 2008

physicsOk, I am not sure how to about about solving this problem and have been staring at it and drawing pictures for several hours now. Do I use the spring equation for potential energy? Or is it a momentum problem where I should assume the spring has it's own velocity? Any help...
October 19, 2008

MathsI think to plot it as a straight line you would plot logy on the y-axis against logx on the x-axis, but I'm not sure.
October 18, 2008

MathsTransform the following relationships/funtions into linear form and identify expressions for the x and y variables. a) (x^2/a^2) + (y^2/b^2) = 1 where a and b are constants. b) k(T) = (kT/h)exp((deltaS)/R)exp(-(deltaH)/RT) where k, deltaS, deltaH and R are constants.
October 18, 2008

MathsA(t)=A'e^(-t/r) where A(t) is the amount after time t, A' is the initial amount at t=0 and r is the decay time. Give an interpretation of the parameter r.
October 10, 2008

chemistrya cubic piece of metal measures 5.00 cm on each edge. if the metal is nickel, whose density is 8.90g/cm cubed, what is the mass of the cube?
September 11, 2008

ChemistryI have worked out that the element is nitrogen and the first hydride is NH3. I calculated the second hydride to have the empirical formula NH2. Would the molecular formula be N2H6? I'm not too sure about the structures.
September 2, 2008

ChemistryTwo hydrides A and B of an element X contain 17.76% and 12.58% by mass of hydrogen. Identify A and B and comment on their structures.
September 2, 2008

year 7 geographyresearch which instruments are needed to measure which feature of the weather Temperature , Precipitation , Cloud cover , Cloud type , Wind direction , Wind speed , Visibility. The example i have got is visibility - eyes and instruments Does the question mean you have to put ...
June 2, 2008

CalculusOK I understand the concept present value but I don't understand how to solve for present value in this context: Assume that you won a local contest for which you gain a continuous income stream at a rate R(t)=5000e^0.1t per year for 5 years and r=0.05. Find present value...
April 29, 2008

algebraA certain population of bacteria doubles every 3 weeks. How long will it take for a population of 3,500 to triple?
April 27, 2008

CaluculusCan anyone help me with this problem? Suppose that during a controlled experiment, the temperature in a beaker containing some chemical substance at time t is rising at a rate of (15/13)t^2-(7t) degrees centigrade per minute. If the temperature after 1 minute is measured to be...
April 22, 2008

Spanish homeworkSorry, I made a mistake. INstead of 'When poachers steal the eggs came' it should be 'When poachers come to steal the eggs.'
April 12, 2008

Spanish homeworkYesterday, I saw Martin Luther sitting on top of a large pumpkin. A cabbage fell from the sky and hit him in the head. Martin Luther was angry and swore at the cabbage. Most people do not know this, but Ralph Waldo Emerson is still alive. He was found buried under a layer of ...
April 12, 2008

EnglishDoes anyone know any specific poems or a website with poems that may relate to any of these themes...? - loss of innocence/youth - taking a chance - being yourself - imagination vs. reality any poems relating to these will do! even a poem that is opposite of the theme will be ...
April 2, 2008

English2 questions: 1. what is the one poetic device called thats an extended metaphor and can last for mostly all of the entire poem? 2. what is the conceit that the tv shows 'rugrats' and 'family guy' share with regards to biabies and speech????? thanks!
April 2, 2008

statisticsIn the U.S. 42% of the population has type A blood. Consider taking a sample size 4. Let y denote the number of persons in the sample with type A blood. a)Pr(y=O) b)Pr(y=1) C)Pr(y=2)
February 5, 2008

chemistryassuming that the calorimeter contains 5.00 * 100 g of water and that the initial temperature is 30.0 degree celcius. what will the final temperature be? (use the proper formula and units, and show your work below)
October 9, 2007

ChemistryI need to come up with an idea of an experiment using only baking soda, sodium chloride,a test tube, soapy water, a scale to measure the mass, and a stop watch..... any ideas...of the procedures to use..? help would be nice thank you soo much!!! =p
September 18, 2007

anatomy and physiology IIThe respiratory menbrane lining the air sacs consist of what? The actual site of gas exchange within the lungs are? the actual site of gas exchange in the lungs are at the capillaries (smallest blood vessels) You are talking about the alveoli. Since this is not my area of ...
July 13, 2007

HistoryI'm doing a project on Medieval nights- please help! How did chivalry reflect medieval culture especially religon? Its due on Monday and i still have HEAPS to do!!!!! Please help me! You mean Medieval knights, right? If you spell it wrong during a search on Google or any ...
May 12, 2007

chemistrytake the amount of grams (.548) and multiply it by .628 You then get .37373 (this is the concentration of ASA that the problem is focusing on) So you divide .37373 by 180.16 to figure out the amount of moles= .002075, divide this number by .250L to get your Molarity, your ...
May 10, 2007

ChemistryI want to know the enthalpy change for this reaction which occurs in a blast furnace: Fe2O3(s) + 3C(s) --> 2Fe(l) + 3CO(g) You will need the heat of formation for CO, and ironIIIoxide, and the heatofmelting for iron. I suspect you have some temperature in mind also which ...
April 15, 2007

math14.what value of n will result in a mean if 31 15.what value of n will result in a median of 23 15.what value of a will result in a range of 84 14,46,19,10,39,22,24,77,n Refresh your memory about the defnition of median, mode and range of a set of numbers. Then pick a value of...
March 4, 2007

FrenchI'm trying to figure out how you would say "he is being" in French. I know it has something to do with the present participle "étant," but we haven't really gotten very far into this yet in class. Would you say "il est étant&quot...
March 4, 2007

home economicswhat are the different names of equipment used for cooking? Please post the names of the equipment that you know. Then, we'll be glad to help you find more names, if necessary.
February 5, 2007

GEOMETTRYHOW MANY VERTEXS DOES A HEXAGON HAVE? Draw a hexagon, a six sided figure, and count the vertices. Thank you for using the Jiskha Homework Help Forum. The following site may help you to see this: http://en.wikipedia.org/wiki/Hexagonal_tiling seee
January 7, 2007

firmswhat are 3 disadvantages of firms merging? Sometimes when firms merge, the company is simply too large or diverse for the management to handle. Sometimes the profits from one of the businesses don't increase as fast as was originally expected. Also -- there's a ...
November 13, 2006

pre-calculusTHe sume of 2 positive numbers is 20. Find the two numbers such that 1) the sum of the square is minimum b) the product of one and the square is maximum. c) the product of the square and one and the cube of the other is maximum I will be happy to critique your work on this.
November 11, 2006

trig questionA Ferris wheel has a deameter of 50m. The platform at the bottom, where you load the ferris wheel, is 3 m above the ground. The Ferris wheel rotates three times every two minutes. A stopwatch is started and you notice you are even with the center of the ferris wheel, going ...
November 2, 2006